CVE-2021-47440

LOWNVD 2.32.3
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

Score 2.3 from GitHub Security Advisory (severity: LOW) published 2024-05-22. NVD baseline CVSS 2.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3

Also known asEUVD-2021-34445 (ENISA EUVD) · GHSA-h8c2-87vw-jwfw (GitHub Security Advisories)Source: ENISA EUVD

2.3EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 2.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

In the Linux kernel, the following vulnerability has been resolved:

net: encx24j600: check error in devm_regmap_init_encx24j600

devm_regmap_init may return error which caused by like out of memory, this will results in null pointer dereference later when reading or writing register:

general protection fault in encx24j600_spi_probe KASAN: null-ptr-deref in range [0x0000000000000090-0x0000000000000097] CPU: 0 PID: 286 Comm: spi-encx24j600- Not tainted 5.15.0-rc2-00142-g9978db750e31-dirty #11 9c53a778c1306b1b02359f3c2bbedc0222cba652 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:regcache_cache_bypass drivers/base/regmap/regcache.c:540 Code: 54 41 89 f4 55 53 48 89 fb 48 83 ec 08 e8 26 94 a8 fe 48 8d bb a0 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 4a 03 00 00 4c 8d ab b0 00 00 00 48 8b ab a0 00 RSP: 0018:ffffc900010476b8 EFLAGS: 00010207 RAX: dffffc0000000000 RBX: fffffffffffffff4 RCX: 0000000000000000 RDX: 0000000000000012 RSI: ffff888002de0000 RDI: 0000000000000094 RBP: ffff888013c9a000 R08: 0000000000000000 R09: fffffbfff3f9cc6a R10: ffffc900010476e8 R11: fffffbfff3f9cc69 R12: 0000000000000001 R13: 000000000000000a R14: ffff888013c9af54 R15: ffff888013c9ad08 FS: 00007ffa984ab580(0000) GS:ffff88801fe00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055a6384136c8 CR3: 000000003bbe6003 CR4: 0000000000770ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 PKRU: 55555554 Call Trace: encx24j600_spi_probe drivers/net/ethernet/microchip/encx24j600.c:459 spi_probe drivers/spi/spi.c:397 really_probe drivers/base/dd.c:517 __driver_probe_device drivers/base/dd.c:751 driver_probe_device drivers/base/dd.c:782 __device_attach_driver drivers/base/dd.c:899 bus_for_each_drv drivers/base/bus.c:427 __device_attach drivers/base/dd.c:971 bus_probe_device drivers/base/bus.c:487 device_add drivers/base/core.c:3364 __spi_add_device drivers/spi/spi.c:599 spi_add_device drivers/spi/spi.c:641 spi_new_device drivers/spi/spi.c:717 new_device_store+0x18c/0x1f1 [spi_stub 4e02719357f1ff33f5a43d00630982840568e85e] dev_attr_store drivers/base/core.c:2074 sysfs_kf_write fs/sysfs/file.c:139 kernfs_fop_write_iter fs/kernfs/file.c:300 new_sync_write fs/read_write.c:508 (discriminator 4) vfs_write fs/read_write.c:594 ksys_write fs/read_write.c:648 do_syscall_64 arch/x86/entry/common.c:50 entry_SYSCALL_64_after_hwframe arch/x86/entry/entry_64.S:113

Add error check in devm_regmap_init_encx24j600 to avoid this situation.

CVSS v3
2.3
EG Score
2.3LOWmedium confidence
EG Risk
10
EG Risk 10/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity23% × 45%
Impact severity (EG Severity): CVSS 2.3 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.2% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
11th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (2.3): severity, escalated by confirmed exploitation. This CVE's 2.3 is its impact severity (EG Severity), not escalated.

EG Severity
2.3 LOWCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-25). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

May 22, 2024

Last Modified

April 2, 2025

References (8)

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
linux5.10.46-4, 5.10.46-5, 5.10.70-1, 5.10.70-1~bpo10+1
  • every version up to 5.10.84-1: fixed in 5.10.84-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 5.14.16-1: fixed in 5.14.16-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 5.14.16-1: fixed in 5.14.16-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 5.14.16-1: fixed in 5.14.16-1
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 37× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 97 of 198 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 3 repeat rows among the latest 100 are merged into the row they repeat. The 101 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-02 16:38 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  2. 2026-11-01 16:30 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  3. 2026-10-31 16:29 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  4. 2026-10-30 16:30 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  5. 2026-10-29 16:29 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  6. 2026-10-28 16:28 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  7. 2026-10-27 16:28 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  8. 2026-10-26 16:28 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  9. 2026-10-25 18:18 UTCEG score recompute
  10. 2026-10-25 16:29 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  11. 2026-10-25 09:11 UTCEG score recompute
  12. 2026-10-25 09:11 UTCGHSA enrichmentGHSA-h8c2-87vw-jwfw · GitHub severity LOW · GitHub CVSS 2.3
  13. 2026-10-24 16:29 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  14. 2026-10-23 16:28 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  15. 2026-10-22 16:29 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  16. 2026-10-21 16:28 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  17. 2026-10-20 16:28 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  18. 2026-10-19 16:28 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  19. 2026-10-18 16:28 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  20. 2026-10-18 08:49 UTCEG score recompute
  21. 2026-10-17 16:29 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  22. 2026-10-16 16:34 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  23. 2026-10-15 16:28 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  24. 2026-10-14 16:29 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  25. 2026-10-13 16:28 UTCEPSS rescoreEPSS 0.2% · 11th percentile
Show 72 more
  1. 2026-10-12 19:05 UTCEG score recompute
  2. 2026-10-12 16:30 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  3. 2026-10-11 23:31 UTCEG score recompute
  4. 2026-10-11 13:44 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  5. 2026-10-10 23:52 UTCOSV refresh
  6. 2026-10-10 19:56 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  7. 2026-10-09 20:04 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  8. 2026-10-08 16:40 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  9. 2026-10-07 23:45 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  10. 2026-10-06 15:14 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  11. 2026-10-05 17:40 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  12. 2026-10-04 23:19 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  13. 2026-10-03 14:22 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  14. 2026-10-02 16:23 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  15. 2026-09-30 15:45 UTCEG score recompute
  16. 2026-09-30 15:00 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  17. 2026-09-29 15:15 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  18. 2026-09-28 13:47 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  19. 2026-09-26 15:54 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  20. 2026-09-26 00:21 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  21. 2026-09-24 14:00 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  22. 2026-09-23 13:45 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  23. 2026-09-22 14:44 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  24. 2026-09-21 20:28 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  25. 2026-09-21 12:19 UTCOSV refresh
  26. 2026-09-20 20:13 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  27. 2026-09-19 15:38 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  28. 2026-09-18 19:24 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  29. 2026-09-17 19:23 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  30. 2026-09-16 14:05 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  31. 2026-09-15 03:06 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  32. 2026-09-12 14:57 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  33. 2026-09-11 14:49 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  34. 2026-09-11 09:33 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  35. 2026-09-08 21:57 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  36. 2026-09-07 15:58 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  37. 2026-09-06 13:45 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  38. 2026-09-05 15:25 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  39. 2026-09-04 13:57 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  40. 2026-09-04 05:03 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  41. 2026-09-02 14:09 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  42. 2026-09-02 09:44 UTCOSV refresh
  43. 2026-09-01 13:51 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  44. 2026-08-30 19:14 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  45. 2026-08-30 01:19 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  46. 2026-08-28 21:38 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  47. 2026-08-27 14:22 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  48. 2026-08-26 14:43 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  49. 2026-08-25 13:46 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  50. 2026-08-24 14:13 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  51. 2026-08-21 23:46 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  52. 2026-08-20 22:52 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  53. 2026-08-19 17:01 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  54. 2026-08-18 13:45 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  55. 2026-08-17 13:44 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  56. 2026-08-16 14:53 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  57. 2026-08-16 08:20 UTCOSV refresh
  58. 2026-08-16 02:11 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  59. 2026-08-15 01:27 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  60. 2026-08-13 21:57 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  61. 2026-08-12 13:48 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  62. 2026-08-11 13:38 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  63. 2026-08-09 13:44 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  64. 2026-08-08 16:34 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  65. 2026-08-07 16:24 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  66. 2026-08-06 13:44 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  67. 2026-08-05 19:15 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  68. 2026-08-04 15:06 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  69. 2026-08-04 10:34 UTCEPSS rescoreEPSS 0.2% · 12th percentile
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  71. 2026-08-02 02:24 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  72. 2026-08-01 04:13 UTCEPSS rescoreEPSS 0.2% · 12th percentile

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2021-47440?
CVE-2021-47440 is a low-severity vulnerability; its CVE record was published on May 22, 2024. In the Linux kernel, the following vulnerability has been resolved: net: encx24j600: check error in devm_regmap_init_encx24j600 devm_regmap_init may return error which caused by like out of memory, this will results in null pointer dereference later when reading or writing register: general…
When was the CVE record for CVE-2021-47440 published?
The CVE record for CVE-2021-47440 was published on May 22, 2024. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of April 2, 2025; the record at its source may have been updated since.
Is CVE-2021-47440 actively exploited?
CVE-2021-47440 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (11th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2021-47440?
CVE-2021-47440 has a CVSS v3 base score of 2.3 (NVD).
How do I remediate CVE-2021-47440?
A fix for CVE-2021-47440 is available: update to the fixed version the vendor names in its advisory.

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